[Lie or not, he doesn't really care. She's asking reasonable questions and offering answers that make sense. She's also plainly not force-feeding him propaganda.]

Good and evil are words used by the small-minded. Light and Dark used as metaphor is equally played out. Yet if the Kenoma is an absence...

[He exhales, mulling over the question. Nothingness...an ending. That was nonsense, wasn't it? True nonsense? Even Palpatine didn't want that. That sets Vader's mind on the matter.]

What forces are in play?